AGENDA PACKET - Laserfiche WebLink

City of Pleasanton—Villages at the Quarry Project 15183 Consistency Checklist Consistency Checklist 59 gasoline-powered vehicles, which would produce low levels of TAC and air pollutant emissions in the local area. Project impacts to existing sensitive receptors were addressed for temporary construction activities and long-term operational conditions. There are also several sources of existing TACs and localized air pollutants in the vicinity of the project. The impact of the existing sources of TACs was assessed in terms of the cumulative risk which includes the project contribution, as well as the risk to the new sensitive receptors introduced by the project. Health Risk from Project Construction The primary health risk impact issues associated with construction projects are cancer risks associated with diesel exhaust (i.e., diesel particulate matter [DPM]), which is a known TAC, and exposure to high ambient concentrations of dust (i.e., PM2.5). DPM poses both a potential health and nuisance impact to nearby receptors. An HRA of the project construction activities was conducted that evaluated potential health effects to nearby sensitive receptors from construction emissions of DPM and PM2.5. This assessment included dispersion modeling to predict the off-site concentrations resulting from project construction so that lifetime cancer risks and non-cancer health effects could be estimated. Summary of Construction Health Risk Impacts The maximum increased cancer risks were calculated using the modeled TAC concentrations combined with BAAQMD CEQA guidance for age sensitivity factors and exposure parameters. Age sensitivity factors reflect the greater sensitivity of infants and small children to cancer-causing TACs. Third trimester, infant, child, and adult exposures were assumed to occur at all residences during the entire construction period. Non-cancer health hazards and maximum PM₂﮳₅ concentrations were also calculated. The maximum modeled annual PM₂﮳₅ concentration was calculated based on combined exhaust and fugitive dust concentrations. The maximum computed hazard index (HI) value was based on the ratio of the maximum DPM concentration modeled and the chronic inhalation DPM Reference Exposure Level (REL) of 5 micrograms per cubic meter (μg/m3). The modeled maximum annual DPM and PM₂﮳₅ concentrations were identified at nearby sensitive receptors to find the Maximally Exposed Individual Resident (MEIR). Results of this assessment indicated that the construction MEIR was located at a residence near the northwestern border